Photo Credit: Greg Nash/The Hill

For weeks, President Donald Trump and democratic presidential candidate Joe Biden exchanged jabs from afar.

“Joe Biden was a disaster,” said Trump.

“This White House has literally a bully pulpit,” said Biden.

On Tuesday, both Trump and Biden will be in Iowa making their case to would-be caucus goers.

In excerpts of his speech released to media, Biden says that Trump is “an existential threat to America” and that “we have to clearly and firmly reject his view of the presidency.”

But on Tuesday, the White House pushed back on the former vice president.

“I think Joe Biden has a lot of questions he needs to answer himself,” said White House Press Secretary Sarah Sanders. “The idea that he would say that the president poses any type of threat is truly laughable considering he was part of the administration that allowed Russia to interfere in our election.”

In Iowa, Trump will tour a plant to tout his administration’s recent approval of corn-based ethanol in gasoline. This move was applauded by Iowa farmers and ethanol producers. This is also a question Biden faces lingering questions on over his push in 2014 to slash the amount of ethanol that refiners must blend into the country’s fuel supply.

Still, a recent poll shows that Biden is leading the pack among democratic presidential candidates.

The former VP is also expected to lay out his plan to address US tensions with China as Iowa farmers have been the hardest hit in President Trump’s trade war.